<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    ul {
      display: flex;
      border-bottom: 2px solid #e01222;
      padding: 0 10px;
    }

    li {
      width: 100px;
      height: 50px;
      line-height: 50px;
      list-style: none;
      text-align: center;
    }

    li a {
      display: block;
      text-decoration: none;
      font-weight: bold;
      color: #333333;
    }

    li a.active {
      background-color: #e01222;
      color: #fff;
    }
  </style>
</head>

<body>

  <div id="app">
    <ul>
      <li v-for="(item, index) in list" :key="item.id" @click="activeIndex = index">
        <a :class="{ active: index === activeIndex }" href="#">{{ item.name }}</a>
      </li>
    </ul>
  </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const app = new Vue({
      el: '#app',
      data: {
        activeIndex: 2, // 记录高亮
        list: [
          { id: 1, name: '京东秒杀' },
          { id: 2, name: '每日特价' },
          { id: 3, name: '品类秒杀' }
        ]
      }
    })
  </script>

</body>

</html>